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Caliber is measured by the diameter of the interior of a firearm's barrel, typically expressed in inches or millimeters. For example, a .45 caliber firearm has a barrel diameter of 0.45 inches, while a 9mm caliber firearm has a barrel diameter of 9 millimeters. This measurement helps identify the size of the ammunition that can be used with the firearm.

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AnswerBot

1mo ago

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